Fuel feeding means



May 3, H, M LEONARD FUEL FEEDING MEANS Original Filed April 2, 1927 yyg 4. 3295,.

ilatented May 3, 1932 'A STATES PATENT iOFFICE HU'WMED LEONARD, DF SOUTH BEND, TNDINA, ASSIGNOR 'TO GERNANDT MOTOR LRPRTION, F CHICGO, LLTINGIS, A CORPORATION F ILLINOIS FUEL ."EEEDING MEANS application led April t2, 1927 Serial No. 1810,503. Renewed October 2, 1930.

This invention relates to engines, and is illustrated as embodied in a two-cycle lDiesel engine ot the crankcase compression type. in object of the invention is to provide a novel fuel-feeding sectional plunger :tor an engine, in which the construction is such as to minimize leakage between the sections oi 'the piunger in compressing fuel mixtures tor injection into the engine cylinder.

Having this object in View, the plunger sections are termed on their adjacent sides with registering grooves or keyways, in which is arranged a member which serves as a stop to check the leakage between the sections, and which preferably also serves as a key connecting the sections. l prefer to operate the sections by means ot a member interengaging with one of the sectlons beyond the end `oi the other section.

rlllie above and other objects and features ot the invention, including various novel combinations of parts and desirable particular constructions, will be apparent from the `following description ot one illustrative embodiment shown in the accompanying drawinv. in which:

lvligure l is a section through the engine cylinder and through the novel fuel-feeding mechanism Figure 2 is a side elevation of the upper part oi' the member which operates the sectional plunger;

Figures' 3 and Li are side elevations, from points ot view 90 apart, of the longer of the plunger sections;

`Figures 5 and 6 are similar side elevations et the shorter plunger section; and

ligure is a top plan view of the assembled plunger.

"The illustrated engine includes a watercooled cylinder l0. having a cylinder-head l2 shown with a compression-relief valve lil, and in which is arranged a power piston i6. The engine is ot' the crankcase-compression two rvcle type, and the details of construction and operation, except as further described below, muje ne varied as desired.

inside and paralleling the engine cylinder 5s :i pump cylinder 18, shown as formed tor eoni'enionr'e in a separate .sleeve 20, and

within which is arranged a novel fuel-feeding plunger built up ot' sections 22 and 24 operated by a third member 26.

Section22 is formed with a wedge-shaped transverse groove or keyway 28, and at its lower end with a lug or iiange which, when the parts are assembled, interlocks with a; corresponding lug on flange 32- of member .26, to provide an operative interconnection or interengagement. 0n its flat face, i. e., on the face toward section 24, section 22 may be provided with a tortuous fuel passage 34 communicating with a passage 36 which registers at the upper end of the plunger stroke with a passage 38 through sleeve 20.

Section 24 is shorter than section 22, and rests against the end of member 26 without any positive interlocking therewith. It is formed on its flat face with a wedge-shaped groovel or keyway 40 registering, when the parts are assembled, with the groove or keyway 28. A member 42 in the registering grooves 28 and 40 serves as a stop to minimize leakage of the compressed fuel mixture downwardly between the two sections of the plunger, and also serves as a key connecting the sections and operating the section 24.

Member 26 is operated by a suitable cam, against the resistance of a spring 44. During the latter part of the downward stroke of the plunger 22-24, which is during the power stroke of piston 16, a charge of fuel is sucked into the pump cylinder through a passage 46, controlled by suitable valve mechanism (not shown). At the end of this downward stroke, and just before the end of the power stroke of piston 16, the upper end of the plunger clears the passage 38, and hot burned or exhaust gases, under considerable pressure. rush througl'l passage 38 into the space above the pump plunger. During the upward .stroke of plunger 22- 24, which takes place during the compression stroke of piston i6, the luel is mixed and vaporized with the exhaust gases, and highl;v compressed, 'the pressure ot the gases in passage 34 serving to torce the sections 22and 24 apart into close engagement with sleeve 20 thus minimizing leakage around the -plun er, the compressed Ifuel mixture isinjecte into the engine cylinder through passage 38, and as both the air in the engine cylinder and the fuel mixture are at a high temperature, ignition of 'the fuel takes place spontaneously.

While one illustrative engine has been described in detail, it is not my intention to limit the scope of the invention to that particular engine, or otherwise than by the terms of the appended claims.

I claim: K

1. A fuel-feeding plunger for an engine, comprising, in combination, sections separated lengthwise of the plunger having a fuel passageway therebetween and formed with registering keyways on their adjacent sides, and a keyy in said keyways connecting the sections and also serving to check leakage between said sections.

2. A fuel-feeding plunger for an engine, comprising, in combination, sections separated lengthwise of the plunger and formed with registering transversely tapered grooves on their adjacent sides, and a member in said grooves serving to check leakage between said sections.

3. Afuel-feeding plunger for an engine, comprising, in combination, sections separated lengthwise of the plunger and formed with registering keyways on their adjacent sides, and a key in said keyways connecting the sections and also serving to lcheck leakage between said sections, together with an operating member interengaging with one of said sections beyond the end of the other section.

4. A fuel-feeding plunger for an engine, comprising, in combination, sections separated lengthwise of the plunger and formed with registering grooves on their adjacent sides, and a member in said grooves serving to check leakage between said sections, together with an operating member interengaging with one of said sections beyond.

the end of the other section.

5. A fuel-feeding plunger for an engine comprising, in combination, sections separated lengthwise of the plunger for a portion of its length only providing a fuel passageway betweensaid sections, one of said sections provided with a transverse passageway leading into the space between the sections, said sections provided with registering keyways below said transverse passageway and .a key therein locking said sections together.

6. A fuel feeding device for an engine comprising an operating member having a lug, a cylinder, a plunger therein formed of two axially split sections having a fuel passagewa therebetween, one of said sections interloc ing with said lug, and means coacting with both sections to restrain axial movement therfietween.

7. A fuel feeding device for an engine comprising a reciprocating member having an undercut lug, a cylinder, a plunger therein .formed of two semi-cylindrical sections having a fuel passage therebetween, one of said sections having a projection engaging said lug, both of said sections having registering transverse keyways, and a key within said keyways.

8. A fuel feeding device, comprising a cylinder, a plunger therein formed of two axially split sections having an axial fuel passage therebetween, one of said sections having a transverse fuel passage in communication with the axial passage, and a member below the transverse passage interlocking the sections and sealing the split therebetween.

9. =A fuel feeding device comprising a cylinder, a plunger therein formed of two axially split sections having a fuel passage therebetween, one section having a radial passage intersecting said axial passage, said sections having registering slots on their plane faces below said radial passage, and a combined sealing and driving member within said slots.

In testimony whereof, I have hereunto signed my name.

HOWARD M. LEONARD. 

